Website Cannot Be Reached by Googlebot for Mobile Validation

Google keeps reporting 'Page Cannot Be Reached" 

We are trying to get Google to validate our website for Google Advertising and it keeps reporting it fails. Google reports the site is NOT mobile-friendly. They suggest using this link to validate. https://search.google.com/test/mobile-friendly

We have validated the HTML code and it passes to be mobile-friendly, however, when trying to access by URL the test fails because it cannot access the page. (see attachment).

2 posts were merged into an existing topic: Website Cannot Be Reached by Googlebot